get_vfpcontext
get_vfpcontext(td, &mcontext_vfp);
get_vfpcontext(td, &frame.sf_vfp);
get_vfpcontext(td, &vfp);
get_vfpcontext(td, buf);
void get_vfpcontext(struct thread *, mcontext_vfp_t *);